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Background <p>With the enforcement of stricter marine environmental regulations by the International Maritime Organization (IMO) and the growing trend of decarbonization in the shipping industry, newly constructed ships are increasingly adopting alternative fuels. In particular, dual-fuel (DF) diesel engines that use natural gas alongside diesel fuel can reduce greenhouse gas emissions due to the higher low-level heat generation of natural gas compared to conventional diesel oil. However, DF engines introduce additional torsional vibration forces in the engine shafting system, necessitating effective vibration control measures.</p> Methods <p>To mitigate torsional vibrations in the engine shafting system, viscous dampers are commonly installed at the front end of diesel engines due to their cost-effectiveness. However, traditional viscous damper design theories assume no elastic connection between the inner and outer rings, which limits their effectiveness. This study investigates the dynamic characteristics of viscous dampers by analyzing the limitations of conventional designs and proposing an improved modeling approach that considers the high-viscosity properties of silicone oil. The study evaluates different damper modeling methods and examines the impact of operational parameters such as temperature and viscosity variations.</p> Results <p>The findings indicate that the torsional stiffness coefficient of the viscous damper is significantly lower than that of a viscosity-spring damper, reducing its ability to effectively control torsional vibrations. By refining the modeling approach and incorporating viscosity-dependent behavior, an optimized high-viscosity silicone oil-based viscous damper design is developed for marine operational conditions.</p> Conclusion <p>This study establishes improved design criteria and vibration control guidelines for viscous dampers used in marine DF diesel engine shaft systems. The proposed modeling approach enhances the reliability and safety of diesel engine shaft systems by providing better control of torsional vibrations in maritime applications.</p>

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Effects of Viscous Damper Characteristics Under Marine Operation Conditions on Torsional Vibration of a 4 Stroke Marine Diesel Engine Shafting System

  • 期刊论文

  • 发表日期：

    2025年3月10日

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  • Yang Gon Kim,
  • Jung Seong Park,
  • Jong Jik Lee

摘要

Background

With the enforcement of stricter marine environmental regulations by the International Maritime Organization (IMO) and the growing trend of decarbonization in the shipping industry, newly constructed ships are increasingly adopting alternative fuels. In particular, dual-fuel (DF) diesel engines that use natural gas alongside diesel fuel can reduce greenhouse gas emissions due to the higher low-level heat generation of natural gas compared to conventional diesel oil. However, DF engines introduce additional torsional vibration forces in the engine shafting system, necessitating effective vibration control measures.

Methods

To mitigate torsional vibrations in the engine shafting system, viscous dampers are commonly installed at the front end of diesel engines due to their cost-effectiveness. However, traditional viscous damper design theories assume no elastic connection between the inner and outer rings, which limits their effectiveness. This study investigates the dynamic characteristics of viscous dampers by analyzing the limitations of conventional designs and proposing an improved modeling approach that considers the high-viscosity properties of silicone oil. The study evaluates different damper modeling methods and examines the impact of operational parameters such as temperature and viscosity variations.

Results

The findings indicate that the torsional stiffness coefficient of the viscous damper is significantly lower than that of a viscosity-spring damper, reducing its ability to effectively control torsional vibrations. By refining the modeling approach and incorporating viscosity-dependent behavior, an optimized high-viscosity silicone oil-based viscous damper design is developed for marine operational conditions.

Conclusion

This study establishes improved design criteria and vibration control guidelines for viscous dampers used in marine DF diesel engine shaft systems. The proposed modeling approach enhances the reliability and safety of diesel engine shaft systems by providing better control of torsional vibrations in maritime applications.